Hi Monty Dog
Sorry if I ramble on here, but I have found various ways in trapping moments of inspiration.
Occasionally I hear lyrics, so I stick them on a reminder list on my iphone, trapped a lot like that.
Melodies, I do a similar thing and video myself singing it as soon as I hear it, wherever I am, this really helps capture the moment.
here's a short anecdote.
I was in the National Gallery a long time ago, and as I was walking through, I saw a picture that hit me straight between the eyes, I stood there for 30 minutes just looking at it, then I went home, bought a canvas and oil paints and painted it, it came out pretty close, the painting was this:
https://mydailyartdisplay.wordpress.com/2011/05/03/saint-francis-in-meditation-by-francisco-de-zurbaran/didn't think it was my cuppa tea, but it was....
The funny thing was that it happened again and again with Cezanne, Picasso and Di Chirco, I never wanted it, nor was I a painter, but something happened that I could not control, it took over my life for 5 weeks at a time, couldn't think nor concentrate, they are hanging around the house now, I gave the Zurbaran to a nun on Holy Island.
The point I'm trying to put across is that I couldn't paint, but I didn't let that get in the way. You'll find a way, use the midi editor, get some friends round, put out a collaboration request in this forum, you'll find a way.
Hope this helps
cpm